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block: add blk_in_drain() API

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The BlockBackend quiesce_counter is greater than zero during drained
sections. Add an API to check whether the BlockBackend is in a drained
section.

The next patch will use this API.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20230516190238.8401-10-stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2023-05-16 15:02:27 -04:00 • committed by Kevin Wolf
parent 9998f70f66
commit ff82b7835b
2 changed files with 8 additions and 0 deletions
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7
block/block-backend.c
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@ -1287,6 +1287,13 @@ blk_check_byte_request(BlockBackend *blk, int64_t offset, int64_t bytes)
return 0;
}
/* Are we currently in a drained section? */
bool blk_in_drain(BlockBackend *blk)
{
GLOBAL_STATE_CODE(); /* change to IO_OR_GS_CODE(), if necessary */
return qatomic_read(&blk->quiesce_counter);
}
/* To be called between exactly one pair of blk_inc/dec_in_flight() */
static void coroutine_fn blk_wait_while_drained(BlockBackend *blk)
{